New Sophisticated Analysis Method of Crystallizer Temperature Profile Utilizing Optical Fiber DTS Based on the Stimulated Raman Scattering

Koudelka, Petr; Liner, Andrej; Pápeš, Martin; Látal, Jan; Vašinek, Vladimír; Hurta, Jan; Vinkler, Tomas; Šiška, Petr

doi:10.15598/aeee.v10i2.637

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…The accuracy of point-mode measurements also depends on the size of the sensory ring (inner diameter of the ring) and the length of optical fiber in the sensory ring [40]. Studies show that the ideal size and length of the sensory ring also depend on the type and external diameter of the optical fiber [40,41]. The inner diameter of the sensory ring should be kept in a range to measure specifically the one-year point and to avoid the adverse effects of optical fiber bending.…”

Section: Discussion and Comparisonmentioning

confidence: 99%

Analysis of Seepage in a Laboratory Scaled Model Using Passive Optical Fiber Distributed Temperature Sensor

Ghafoori

Maček

Vidmar

et al. 2020

Water

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Seepage is the key factor in the safety of dikes and earth-fill dams. It is crucial to identify and localize the seepage excesses at the early stages before it initiates the internal erosion process in the structure. A proper seepage monitoring system should ensure a continuous and wide area seepage measurement. Here, continuous monitoring of seepage at the laboratory-scale is achieved by a passive optical fiber Distributed Temperature Sensing (DTS) system. An experimental model was designed which consists of initially unsaturated sand model, water supply, seepage outflow, optical fiber DTS system, and water and air temperature measurement. Initially, the sand temperature was higher than the temperature of the seepage water. An optical fiber DTS system was employed with a high-temperature resolution, short sampling intervals and short time intervals for temperature monitoring in the sand model. In the system, the small variation in the temperature due to groundwater flow was detected. The numerical analysis was conducted for both the seepage process and the heat transfer progression in the sand model. The results of the heat flow simulation were evaluated and compared with the measured temperature by the optical fiber DTS. Obvious temperature reduction was obtained due to seepage propagation in the sand. The rate of temperature reduction was observed to be dependent on the seepage flow velocity.

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Section: Discussion and Comparisonmentioning

confidence: 99%

Analysis of Seepage in a Laboratory Scaled Model Using Passive Optical Fiber Distributed Temperature Sensor

Ghafoori

Maček

Vidmar

et al. 2020

Water

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“…Technologically, the optical fiber DTS is based on optical reflectometer principle. In the optical fiber a light pulse is transmitted with wavelength of 975 nm, 1064 nm or 1550 nm (in dependence on construction of DTS) and with width of 10 ns [1,6].…”

Section: Distribution Temperature Systemmentioning

confidence: 99%

“…The next step was the determination of the precise location of each measuring point. This was achieved by gradual heating of each point and monitoring the temperature curve on the measured route [6,8]. The measurement was carried out at the Department of telecommunication at the VSB -Technical University of Ostrava.…”

Section: Experiments Descriptionmentioning

confidence: 99%

Measurement of the microwave emitter's inhomogeneity using optical fiber DTS

et al. 2014

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Researcher's teams were dealing with the microwave emitter's inhomogeneity problem since the microwaves were used. One possible way, how to measure electromagnetic field is the measurement on inhomogeneous temperature distribution on the irradiated sample, which can cause problems as in other material processing, so in the undesirable change of properties and even security. Inhomogeneity of electromagnetic field is specific by creating spots with higher or lower temperature called "hot spots". This inhomogeneity strongly affects the temperature distribution in the cross section of the material and its resultant heating. Given the impossibility of using classical electronic devices with metal temperature sensors were various indirect methods used in the past. This paper deals with experimental measurement of the microwave emitter's inhomogeneity (2.45 GHz) using the optical fiber DTS. The greatest advantage of this sensor system is just in using of the optical fiber (electromagnetic resistance, small size, safety using in inflammable and explosive area, easy installation). Due to these properties of the optical fiber sensor it's possible to measure the temperature of the sample in real time. These sensor are able to measure the temperature along the fiber, in some cases they use nonlinear effect in optical fiber (Raman nonlinear effect). The verification of non-homogeneity consists in experimental measuring of the temperature distribution within the wooden sample. The method is based on heat exchange in an isolated system where wooden sample serves as an absorber of the irradiated energy. To identify locations with different power density was used DTS system, based on nonlinear phenomena in optical fibers.

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“…This equation is a linear combination of temperature offset (first part of the equation), difference of attenuation in optical fiber (second part of the equation) and temperature measurement on the basis of the anti-Stokes to the Stokes ratio (third part of equation)6 :…”

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confidence: 99%

Measurement of insulation layers using DTS system

Hruby

Kajnar

Koudelka

et al. 2015

Photonics, Devices, and Systems VI

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Fiber optic distributed temperature sensing systems (DTS) are based on the principle of reflectometer and allow us to measure the temperature along the optical fiber. Optical fiber in these systems is used as a temperature sensor which can measure up to thousands of points simultaneously. DTS sensors use nonlinear phenomenon known as Raman scattering for temperature measurement. The advantages of this system include immunity to electromagnetic radiation, low cost of optical fiber, the possibility of measurement to a distance of 10 km and safe use in flammable or corrosive environments. The small size of optical fiber allows using in applications where the dimensions of the other sensors were problematic. A typical example of the DTS application is the fire detection in tunnels and buildings at risk, detection of water leaks on dikes and dams or monitoring of temperature in mine shafts. This article deals with the measurement of temperature transmission over various insulation layers using the DTS system. One of the problems of temperature transmission is that most of the sensors cannot measure the entire temperature profile but only allows a point measurement. This problem is solved by DTS systems with optical fibers. Optical fiber, due to its small size, can be applied among various insulation layers that were formed by rock wool. Three sensory layers formed by rings of multimode optical tightbuffered fiber with 50/125 micron core/cladding dimension were applied. The layers were linked together allowing a direct comparison of measured temperature. Rows of rings were placed on the margins and one was in the middle. Individual rings were linked together into the horizontal lines. Thus we were able to cover the whole surface of the insulation layers. Measurement was carried out in a closed air-conditioned room for 37 hours. Graphs with the progress of temperature at time and place were compiled from the measured data.

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New Sophisticated Analysis Method of Crystallizer Temperature Profile Utilizing Optical Fiber DTS Based on the Stimulated Raman Scattering

Cited by 6 publications

References 4 publications

Analysis of Seepage in a Laboratory Scaled Model Using Passive Optical Fiber Distributed Temperature Sensor

Analysis of Seepage in a Laboratory Scaled Model Using Passive Optical Fiber Distributed Temperature Sensor

Measurement of the microwave emitter's inhomogeneity using optical fiber DTS

Measurement of insulation layers using DTS system

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